20011111211212 has 24 divisors (see below), whose sum is σ = 39520376375760. Its totient is φ = 8782305860160.

The previous prime is 20011111211191. The next prime is 20011111211237. The reversal of 20011111211212 is 21211211111002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7841343243 + ... + 7841345794.

It is an arithmetic number, because the mean of its divisors is an integer number (1646682348990).

Almost surely, 2^{20011111211212} is an apocalyptic number.

20011111211212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20011111211212 is a deficient number, since it is larger than the sum of its proper divisors (19509265164548).

20011111211212 is a wasteful number, since it uses less digits than its factorization.

20011111211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15682689081 (or 15682689079 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20011111211212 its reverse (21211211111002), we get a palindrome (41222322322214).

The spelling of 20011111211212 in words is "twenty trillion, eleven billion, one hundred eleven million, two hundred eleven thousand, two hundred twelve".